Improvement in furnaces for steaivi x b boilers



Furnaces for Steam-Boilers. No.147,043. Pate ntedFeb.3.1874

ATTORNEYS All. RHOiZi-L/THOGRAPH/L Co. MK (OSEDRNE'S PROCESS) 0.1.BASEMENT.

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llNITED STATES ATNT DANIEL T. (/ASEMENT, OF PAINESYILLE, OHIO.

IMPROVEMENT IN FURNACES FOR STEAM-BOILERS.

Specification forming part of Letters Patent No. 147,043, dated February3, 1874; application filed December 18, 1 '3.

To all whomit may concern Be it known that I, DANIEL THOMAS CASE- )IENT,of Painesville, in the county of Lake and State of Ohio, have invented anew and Improved Steam-Boiler, of which the follow ing is aspecification:

My invention relates to improvements in furnaces for steam-boilershaving balls, blocks, or scaps of iron, steel, or other metal combinedwit-h them for facilitating combustion bottom up through the tire andinto the waterspace above the crown-sheet with stuffingjoints, andhaving the grate for supporting the balls or other pieces of metalattached to it, said grate being composed of tubes which receive thewater for protecting them from said vertical tube, and deliver it at theouter part to a coil which secures the balls against bearing on the sidewalls of the furnace, and also circulates between the balls to keep themfrom fusing, and for generating steam, and finally discharges into thecentral supportingtube or into the space above the crown-sheet,

all in a way calculated to promote an efficient circulation of the waterin the said grate for its protection, and to promote rapid generation ofsteam. The invention also consists in hollow dampers arranged in thesmoke-stack for utilizing the waste heat.

Figure 1 is a sectional elevation of a portion of a steam-boiler with myimprovements, and Fig. 2 is a horizontal section.

Similar'letters of reference indicate corresponding parts.

A is the fire-space; B, the grate for the fuel; 0, the vertical tube forsupporting the balls or scraps; D, the grate for the balls E, the balls;F, the coil connecting with the outer portion of the grate and confiningthe balls from the walls of the furnace, also preventing them fromfusing, and also for discharging into the main pipe for promoting thecirculation of water in the grate and the generating of steam. G is thelower stuffing-box H, the upper one; I, the supporting and adjustinglever; J, a rod connecting them for .raising the grate and lowering it.Any aptom, if necessary, but with a well, X, in the bottom, as hereshown; for the tube 0, it will not probably be required. If it isdesirable not to have a water-space below the ash-pit, in order to makemore room for the latter, the well may be connected to the water-spacesat the sides by tubes. To protect the tube 0 from being burned androughened, so as not to work well in the upper stufling-box, thepacking-joint may be arranged in the waterspace and a protecting-tubemay extend downward from the crown-sheet around the pipe for somedistance, and, in addition thereto, that portion of the tube working inthe packing-joint may be made wholly or inits exterior portion of metalhaving greater heat-resisting power than iron. By the circulation of thecoil F between and around the balls they will be largely benefited byprotection from heat, and the generating of the steam will be largelyincreased. The vertical tube will also largely aid in the generating ofsteam. The coil F isv in this example made to fill a considerableportion of the fire-space above the balls, which do not need to be veryhigh for the purposes for which they are used to increase thesteam-generating capacity, and it may enter the pipe 0 for returning thesteam to the boiler; but in this case, being made in several separatecoils, they are made to connect directly with the crown-sheet by astuffing-joint, a, so that they can rise and fallwitli the grate.Several shortcoils are considered better for keeping full of water thanone long coil. The return-tubes Y in the crown-sheet also aid inutilizing the heat. In the lines I arrange a series of hollow dampers orvalves, \V, with water connections through their axes for a circulationthrough them to take up as much of the remaining heat as possible beforepassing off into the flues, and these valves or gates will be connectedby gear-wheels V, (shown dotted,) so arranged that by turning one foropening or shutting it the others will be turned by it in like manner,but in reverse direction, so that when they are partly open they afforda zigzag course for the heat, which is thus caused to impinge directlyagainst the side of one gate as it escapes from the one below, thusobtaining the best possible effect on the water contained in the valves.This plan is alike applicable to horizontal fines, and may be extendedany required length in either kind. Besides the direct escape-fines inthe top of the boiler, I also propose to have one or more return-fines,A extending from the crown sheet down through the water-space, out at ornear the bottom, and up to the escape-pipe, with these water-dampers Xin them for sending the draft through them to utilize all of the heatthereof in excess of that of the water in the boiler at the lowest part,where it is the coolest. Jet-pipes, one or more, are arranged the underside from drawing up the fire or any portion of it. I will have dampersbetween the fire and the balls, to be closed to relieve the fire of thesuction.

Having thus described my invention, I claim as new and desire to secureby Letters Pate111:

1.- The tubular grate for holding the balls, attached to a centralvertically-adj ustable tube, 0, and connected at the outer part to acoil, F, circulating around and between the balls, and returning to thecentral tube or directly to the water-space, substantially as specified.

2. The combination of a coil, F, with. the balls E and theirsupporting-grate D, for the protection of the balls and for generatingsteam, substantially as specified.

3. A series of hollow dampers or gates arranged in the flues, and havingconnections for a water circulation through them to utilize the escapingheat, substantially as specified.

DANL. T. GASEMENT.

\Vitn esses:

T. B. MosHER, ALEX. F. RoBERTs.

